On Tuesday, January 4, 2011 11:26:48 AM UTC-7, MRAB wrote:
> On 04/01/2011 17:11, Jeremy wrote:
> > I am trying to write a regular expression that finds and deletes (replaces
> > with nothing) comments in a string/file. Comments are defined by the first
> > non-whitespace character is a 'c' or a dollar sign somewhere in the line.
> > I want to replace these comments with nothing which isn't too hard. The
> > trouble is, the comments are replaced with a new-line; or the new-line
> > isn't captured in the regular expression.
> >
> > Below, I have copied a minimal example. Can someone help?
> >
> > Thanks,
> > Jeremy
> >
> >
> > import re
> >
> > text = """ c
> > C - Second full line comment (first comment had no text)
> > c Third full line comment
> > F44:N 2 $ Inline comments start with dollar sign and go to end of
> > line"""
> >
> > commentPattern = re.compile("""
> > (^\s*?c\s*?.*?| # Comment start with c or C
> > \$.*?)$\n # Comment starting with $
> > """, re.VERBOSE|re.MULTILINE|re.IGNORECASE)
> >
> Part of the problem is that you're not using raw string literals or
> doubling the backslashes.
>
> Try soemthing like this:
>
> commentPattern = re.compile(r"""
> (^[ \t]*c.*\n| # Comment start with c or C
> [ \t]*\$.*) # Comment starting with $
> """, re.VERBOSE|re.MULTILINE|re.IGNORECASE)
Using a raw string literal fixed the problem for me. Thanks for the
suggestion. Why is that so important?
Jeremy
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